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query At query level, you are merely determining the way the data is displayed, whereas in server sort order, you are affecting the way data is actually stored Sort order is very important because a poor choice here could cause queries to return incorrect data sets from queries For example, if you have chosen to include case sensitivity as an option, and are running a query to find a list of people named Smith, your result set would include only data that matched the case specified in the query If you specified Smith, the result set would return all those entries that matched Smith, but would ignore any entries that had been made as smith or SMITH or any other variation of case.

SQL Server has a rich pallet of system stored procedures for managing triggers from Transact-SQL. Listing Triggers To list triggers associated with a table, use the system stored procedure sp_helptrigger:

CREATE Procedure prUpdateEquipment -- Check if values were changed in the meanwhile -- Update values in equipment table.

sp_helptrigger 'Order'

The server returns the list of triggers associated with the specified table and displays the type of trigger found in the isupdate, isdelete, and isinsert columns.

trigger_name trOrderStatus_U trOrderStatus_U_1 (2 row(s) affected) trigger_owner dbo dbo isupdate 1 1 isdelete isinsert 0 0 0 0 -------------------- -------------- ----------- ----------- --------

Viewing Triggers You can obtain the code for a trigger using the system stored procedure sp_helptext:

sp_helptext 'trOrderStatus_U'

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@intEquipmentId int, @chvMake varchar(50), @chvModel varchar(50), @intEqTypeId int, @debug int = 0 As declare @intNewEquipmentBC int set @intNewEquipmentBC = Binary_CheckSum(@chvMake, @chvModel, @intEqTypeId) if @debug <> 0 Select @intNewEquipmentBC NewBC if @debug <> 0 select EquipmentBC OldBC from EquipmentBC where EquipmentId = @intEquipmentId if not exists (Select EquipmentBC from EquipmentBC where EquipmentId = @intEquipmentId) insert EquipmentBC (EquipmentId, EquipmentBC) select @intEquipmentId, Binary_CheckSum(Make, Model, EqTypeId) from Equipment where EquipmentId = @intEquipmentId -- Check if values were changed in the meanwhile if @intNewEquipmentBC <> (Select EquipmentBC from EquipmentBC where EquipmentId = @intEquipmentId) begin if @debug <> 0 select 'Information will be updated.' -- update information update Equipment Set Make = @chvMake, Model = @chvModel, EqTypeId = @intEqTypeId where EquipmentId = @intEquipmentId if exists(select EquipmentId from EquipmentBC where EquipmentId = @intEquipmentId)

The server returns the code for the specified trigger:

Text --------------------------------------------------------------------CREATE Trigger trOrderStatus_U On dbo.[Order] After Update As If Update (OrderStatusId) Begin Insert into ActivityLog( Activity, LogDate, UserName, Note) Select 'Order.OrderStatusId', GetDate(), USER_NAME(), 'Value changed from ' + Cast( d.OrderStatusId as varchar) + ' to ' + Cast( i.OrderStatusId as varchar) From deleted d inner join inserted i On d.OrderId = i.OrderId End -- For Update

Deleting Triggers A trigger can be deleted, as can all other database objects, using the appropriate DROP statement:

Drop Trigger 'Orders_Trigger1'

Modifying Triggers Earlier in this chapter, you saw details of the syntax of a Transact-SQL statement for creating triggers. Triggers can be modified using the Alter Trigger statement. Since the features of the Alter Trigger and Create Trigger statements are identical, we will not explore the syntax a second time. It is much better to use the Alter Trigger statement to modify a trigger than to drop and then recreate the trigger. During the period between dropping and creating a trigger, a user might make a change

9:

update EquipmentBC Set EquipmentBC = @intNewEquipmentBC where EquipmentId = @intEquipmentId else insert EquipmentBC (EquipmentId, EquipmentBC) values (@intEquipmentId, @intNewEquipmentBC) end return

NOTE: Keep in mind that the order of execution is lost when the trigger is altered you must reset it again using sp_setTriggerorder.

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